Here are the groups for the World Cup:

The Final will have one team from the top row and one from the bottom row.
This means that the final for the World Cup 2022 can actually be Brazil vs Argentina, both teams have been defeated zero times so far.
That would be an incredible final.
I am almost 100% sure that there will be two European teams in the final. Brazil - Argentina is a loud sign in terms of history, but in my opinion now you can make at least 5-6 pairs without these teams that will be most interesting. In the end, there is a separate cup for this couple (America's Cup) and some European teams rarely meet, especially in the finals.